I've been looking at the fastest sailboats in modern times and I've been wondering a few things. Why does the front sail have no boom but the back sail does? Why do racing boats have http://en.wikipedia.org/wiki/Image:Parts_of_a_sail.svg" [Broken] kinds of sails? A lateen sail has more area and doesn't require such a tall mast. Wouldn't it be more stable to use these? Why are hulls shaped with concave curves when veiwed head on? Wouldn't a rounded convex curve be more hydrodynamic?